By-pass valve.



PATENTBD APR. 30, 1907.

W. L. WILSON.

BY-PASS VALVE.

APPLICATION FILED MAY19,1906.

2 SHEETS-SHEET 1.

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A TTORNEYS PATENTED APR. so, 1907.

y W. L. WILSON. BY-PASS VALVE, T N FILED MAY19 WITNESSES:

A TTORNE Y5 UNEYTED iiilli'ililii 5% PATENT OFFICE.

Bwmss VALVE .To all whom i my r'IHI 'I'IIL:

Be it known that; l. Wont-m lncsui; Wu.-

Sapecification of l'iotters Patent.

SON, a citizen oiiho l nitcd cit ate/s, residing 1 Tho objcct of thcjnvcntion is to provide a l by-pass valve especially .ulapted to be used upon. the steam cylinders or steam chests of a locomotivc and so constructcd as to equalize the rcssuro on both sides of the piston head w iile thc steam is cut oil and tho engine is moving and the pistons are rccipro i caring, thus permitting lhc lot-oniotivo to drift without (routing a vacuum in tho s'tcam chest or cylinder. With such a uuwhunism a great saving is oll'vctcd and wcar and tour on tho pucking's and mcchunism is prcvcntcd.

'lhc object. oi lhc prcst-m invoniion is to provido a valve adapted to bc used as above 1fl(li('1ll((l, said vulvo being oi such construction as to provont. slmnming oi' the valve and damage incidental thcrcto, should the prossurc on car-h sidc of the valve become equalized, or when the valve is suhicctcd to suddon changes or pressure. placed at each rod of tho cylinder and the valvc casings cominunit-ntc at one 0nd with the live slcinn passage and at the other cud with the exhaust. passugc. The stcin of tho valvc extends in a lateral direction alrmg tho trsnsvcrse axis on each side of the VfllVO. And beyond tho ends of the said stein dash pots are arranged in the Valve casing. Each cndof the stem provided with a piston which is adapted to reciprocate in its adjacent dash pot and each piston is provided with ports which when their nda arc aiocow cred, permit the pressure to enter the dash pot and operate against the under sides of the said valve stem pistons.

In the accompanying drawings: Figure 1' 1s a vertical sectional view of a cylinder and Thc valves are piston Valve casing having the by-pnss valve attached thereto, Fig. 2 18 a. horizontal sow tional View of the by-pnss valve, l ig. 3 is a 1 vertical sectional view of one form of thc b v are provided with the pistons 17 and 18 re' view of a modified form of the byass valve.

The drawing shows but one cy indcr t'asing of a-locomotivc of the ordinary piston l 1 me tor Agni 36,1967;

positc sido ol' tho hood is zi-duplicutc o'l' tho ono shown. i i 'lhc ovhndt-r casting l isprovidcd withthc inlet pnssugo -l and puss-ages 5, one com-' muuim'uing.will! onc cnd ol' [lac cylindor and the other with tho opposito cud und 6 is llic cxhliust passage commuuicnim \\'llll 1 v ports at cuc'i cud ol U10 valv'c casing.

in tho drawing the piston and its rod as wll as tho piston vulvc are omitted as tlu-s'r parts form no part of mv invcn-tion and are of tho construction ordinarily used in this typo of cnginc. 1

Steam is admitted from the boiler through the control livo strum pnssagc 4 to a mssugc 5 and into our cud of tho cylinder wliilc the stczuu is pxhuusling from the-oppositc and ol'-- the cyl nder through the other pa'ssngrr-Sio 1 tho exhaust pnssug ll and whcn tho vnlvo is moved in the opposite direction, lho puss'ngrc of thc strum and exhaust arc rcvcrscd- I lipon thc piston valve casing tl cliv-puss vnlvv casings 7, 7 arc located. 'lllucasings 7 communicate with tho c vlindonpo'rts and with the live steam space. It is understood that avalve casing 7 is locatcd one at each end of the piston valvc r nsing. .13 reference to Figs. 2, 3 and 4 of the drawing, the construction of the lay-pass valve may be understood. Within the casing 7 is arranged the partition 8 which is providcdwithon opcning 9 ground at its edge to form a valve seat. l0. Said partition Scxtcnds at nuan gle of about {15 degrees to a pcrpvndicular erected from the point of attncluncnt bovccn thc said casing 7 and its support. The valvc .1 is adaptod to scat against the valve seat 10. Said valve is provided oncadh side and along its central axis with the stems 12 and 13. a The casing 7 is providcdat onoside with a rcccss 14 which located directly 0 mositc tho opcning: l) oithe partition 8 and which constitutcs a dash pot. The opposite side of tho casing 7 is provided with a removable plate 15 which on its under sidc is provided with a l'ocoss 16 which also constitutcs a'dash pot and is located dircctly opposite the opening 2) of the partition S but on the opposite sidc thorool' from the dash pot 14. 'llic oxtrornc ends of the'stcms 12 and 13 spcctivcly. 'lhedpiston 17 is adapted to re-- ciprocate in the ash pot '14 and the piston is adopted to reciprocate in the dash pot vnlvc typo. 'lhc cylindcr rusting on tho 0p b0 c vlindcrfi and tho vnlvo chumbcr 3, :1 stczun:

16. The said: pistons 17 and 18 are provided]:

"with the laterally extending ports 19 which" dinally extending port 20. The end the ,port'20 isin -the center of the face of its respect'ive piston. The orts 19 are located 'sub'stantially about ha f way between the fiosite faces of the piston. IO. 7

y reference to Figs. 3 and 4 it will be ob served that the longitudipal central axisof the valve stems 12" and 13' are alined and that they extend at right angles to the partition 8 and consequently they are'inclined. at an angle of approximately 45 degrees to a perpendicular.

In the form of the casing 7 as shown in Fig. 4, the b'y-pass valve is adapted to be aplied to the inclined side of a steam chest while in the form of the invention as shown in Fig. 3, the said casing is formed in order that the valve may be applied to the top of the steam chest although the said casings may be applied at any point between the live steam passage and the cylinder passage as in some types of engine'it maynot be conven ien't to lace the valves in the position shownin the rawings.. It will also be understood that while I-have shown a locomotive with a central steam supply passage and end exhaust passages, this invention can be applied to arrengine having end steam passages anda central exhaust without departing from'the 1 spirit of the invention.

. the other.

It will thus be seen that when liv e steam enters'the passage 5, that the pressure will pass up the end 21 of the casing 7 and lift the valve 11 and seat the same against the seat .10, thus closing the opening 9 of the partition 8. Thus when the steam is on, both of the by-pass valves are closed. .When the steam is cut ofi from the cylinder and the engine is in motion, the valves 11. will fall away from the seats 10 and thus both ends of the cylinder 2 are connected together and. as the piston (not shown) reciprocate-s in the cylinder 2, the air passes from one end of the said cylinder to Thus there is no obstruction offered to the free reciprocation of the cylinder piston. The dash pots 14 and 16tothereto prevent the'valve 11 from slamming 'iwhen-working toward'the seat 10 or away from the same.

That is the said dash pot mechanisms act as shock absorbers and cause thesaid'valve 11 to seat or'unseat gently..

It being understood that under certain conditions,-thepressure on each side of the valve 11 may be equalized 'to such an extent that without the dash pot mechanisms, the said valve would rattle and again, when sub mitted to sudden pressure, would move with such rapidity as to cause damage when brought to a sudden stop. The small ports located in the valve stem pistons are adapted to admit the steam to the dash pot in' the live steam end of the valve. I Thus it will require a slight excess of pressure against the cylinder surface or end of the valve to move it from its seat. "Therefore, 1t Wlll not'leave its seat underthe conditions above mentioned Again when the valve is opened, the pressure is'admitted lo the opposite end of the dash pot at which time it will require an excessive pressure on the live steam end to close the valve. This will to' a great extent prevent the slamming of the valve when the engine is drifting and at the same time, will not destroy the cushion of the valve in the dash pots. i

Having described my invention, what I claim as new anddesire to secure by Letters,

Patent is:

In combination with a cylinder having a movable piston a valve adapted to equalize the pressureon )oth sides of said piston, said valve consisting of a casing having a valve seat, a valve adapted to engage said seat, said valve having on its opposite faces extending stems, pistons located at the ends of said valve stems, recesses formed in the casing and receiving said pistons and adapted to operate as dash pols, said pistons having,

ports which extend from the piston sides to I the faces thereof.

In teslimony that I claim the foregoing as my own, I have hereto allixed my signature in the presence of" two witnesses:

c WILLIAM LESLIE WVILSON.

-Witncsses:

W. H. Snvis, lt-L. JONES. 

